I have a vk60. Close enough for this topic I think. I've tried and like all the following for different reasons.
Fatboy gold 2000-great mids-no slouch elsewhere
FIM Gold-awesome bass, little relaxed elsewhere-smooth-
Kimber Palladian 10-very neutral, black as night background-don't even notice it's there-which is a good thing.
Transparent ref xl-somewhere between the fim and kimber.
Which one depends on what you're looking for, and your other equipment.. All can be had used for around 500-700.
Fatboy gold 2000-great mids-no slouch elsewhere
FIM Gold-awesome bass, little relaxed elsewhere-smooth-
Kimber Palladian 10-very neutral, black as night background-don't even notice it's there-which is a good thing.
Transparent ref xl-somewhere between the fim and kimber.
Which one depends on what you're looking for, and your other equipment.. All can be had used for around 500-700.